How then do you prep for solid secondary bonding when joining the wing halves, spars, and other guts?

Hey Adam, i used to use a strip of peel ply over where the spars will go. This doesnt risk pulling the layup out as much as you aren't pulling from right at the edges. Now I skip it all together and just give the bonding surfaces a sand with some coarse grit paper- seems to work pretty well.

I had a leaking mould once so my pump had to run full time till the part cured. Next morning it was way too hot to touch. I dont think it would be very good for it. Mick (auselectric) and I both have the same vacuum switch, it was cheap and makes the whole thing much easier.http://www.veneersupplies.com/produc...er-18-NPT.html